1997 Mercury 150a

[Dukedog]

those are wh... they went away in 1990!... then came wmh for a few tears then wmv's... been some southern engineering done on your motor....

on top, on tha flange there should be a WH number...

 

[Dukedog]

they have tha smallest venturi of all tha wh's so were probably pre '90 2.0 135 carbs ta start with..... if no wh number tha only way to tell for sure which series they are will be by main and idle jet size as those are tha only horse power rating difference in that series......

picture of your motor... left side of block.and exhaust divider plate.

 

[Worm0129]

So picture of left side later today when I'm home. The motor appears to be this one.... MERCURY > V-150 > 4868998 THRU 0A904645 , at least all the parts match up with what I have. What size jets should it have to be a 150hp? Any other pictures that would help you? Look at photo of top of carb on post #10. No other numbers with the "WH".

 

[Dukedog]

'97 150a? where did you get this as your motor?

 

[Dukedog]

all bets are off! shoulda went back ta look at 'em earlier..... don't need anymore pictures....

after goin' back n lookin' at all your pictures you have a "first generation" motor... last year of that style was 1982.... its OLD.

what size were tha jets ya took out? ya listed several? just main and idle.. not concerned with vent.

 

[Worm0129]

It looks as if #10 Jet, Main Fuel, I have several (.064, .066, .050) and #20 Jet Main, Idle Air Bleed, I have (.044, .046, .050).
It was offered to me with the boat, as a 1997 150 hp. I realized it was older; casting stamp of March ?9. Label on starter is 1979 production year. I started looking at 150 hp Mercury on the Marine engine . com and Boats . net sites until I found a parts diagram that looks like it.
I can find main Fuel Jets in size/carb#: 064/WH33, .048/WH32, .050/WH35, .052/WH38. And Jet, Idle Air Bleed: .056, .058, .060, .046, .048 (same WH#'s as above).

 

[Dukedog]

which ones came outta your carbs?

 

[Worm0129]

Main (#10 on attachment) Top Carb = Left .066 Right .064 Middle Carb = Left .066 Right .064 Bottom Carb = .066 Right .066 Yes bottom is different.
Idle (#20 on attachment) .048 .050 .044 .044 .048 .048
I'm thinking they should all 6 be the same top to bottom for the main and then different size for idle, but all 6 the same. Is that right?
Also just noticed in this attachment that there are Jet, Bowl Vent (#2) size .096 or .098. None of my 3 carbs have these. Is that a problem? I wonder what else is missing and is on the ground at the shade tree.
Should I just look for 3 newer carbs? If so, which ones?

 

[Dukedog]

those are close on mains... idle, not so much.. near as i can get will be all 6, 64's main and all 6, 56's idle (these seem a little big ta my way of thinkin', but do have very small venturi)..... can't find ANY wh with 66's.... will do some more searchin'.... didn't do to much with tha early 135's... vents are really not necessary.. you'll never know they are not there

 

[Worm0129]

I can order 54's for the idle if you think the 56's are to big. I found a post on a site that said "...if there is a '3' on the casting it's a 135, a '5' it's a 150, a '7' it's a 175..." See picture in post #10, I have a "5" on the linkage side of motor with date in casting. So, 150 hp? Makes as much sense as anything with this motor.

 

[Dukedog]

there's a whole lotta stuff on tha computer bout carburetors/numbers.. only thing ya can take to tha bank is tha wh, wmh, wmv number... tha rest is just parts!... most ya take with a grain a salt...
start with all 66's and all 48's...... that will be safe.. may need ta go up on idles after ya get it runnin'.............

 

[Worm0129]

Thank you. I'll order them this afternoon. Hope to test run in 7-10 days. I'll let you know results.

Dukedog, is there any difference between the "idle" and "main" jets? Other than the opening size? I see the parts listing for idle as: .046, .048, .056, .058, .060 and the main as: .048, .050, .052, .064. Are they interchangeable? I don't see any .066 available. Do you know a site that sells them?

 

[Worm0129]

Hey Dukedog,
My last post was April 26, 2016....
I'm still messing with this engine. I've got it narrowed down to "Serial numbers 5129480 through 5503246 are 1979 models." with a "Clam Shell Cowl". Anyway, I rebuilt the fuel pump and all 3 carbs including 12 new idle and 12 new main jets. Replaced the fuel lines including the 'bleed lines". It runs but not well. I checked the compression with a better tester and I have 130-138 psi on all 6 cyl. I checked the timing and it is OFF the scale when I check it at full throttle. I removed all the plugs and grounded the plug wires.
What should the idle timing and full throttle be set at?
Also I'd like to get a repair manual, what brand do you recommend?
Thanks.

 

[Dukedog]

just for starting on tha hose start with something like 0 ta 4 degrees ATCD (retard) for idle... 20 degrees BTCD (advance) crankin' and done for wot... you need ta reset idle after ya get it runin' at tha lake... needs ta be in gear, in tha water.. numbers make no difference... what ever timin'/rpm make both you and tha motor happy is what its gonna be so don't be to concerned with "numbers"....

oem manual if ya can find one.. maybe ebay.. one for later V6 carb motors that start with 0A or 0B will work also 'cause all tha basics are tha same....jus some of tha stuff pictured will look a little different...

 

[Worm0129]

Thanks Dukedog. I'll get to that later this week.

 

[Worm0129]

Dukedog, If you are still around and afloat, I'm back with more questions / problems with this 1978-1979 V150. Was having problems with it running again and trouble shot down to the stator. (#398-5454A9). Only 3.84K ohms on blue/red cylinders 2,4,6. Open resistance (no ohm reading) on blue & wht/red & wht cyls 1,3,5. Ordered a replacement stator, 2 new switchbox (#332-7778A 9), and a rectifier (#816770). Installed all parts, tried to start = didn't start. Rechecked wires, realized I had blue/red blue &wht/red & wht on switchboxes. Corrected wires = still not start. Also put in new plugs.
Checked resistance on new stator = 6.35K & 6.08K instead of 3.4K ohms.
Questions: 1--Is the stator the wrong one? 2--Did I majorly screw things up by having blue/red on wrong switchboxes? 3--What is the next step in diagnosing this beast? My wife has HINTED STRONGLY that I should get rid of the boat. Help!
Original post was from Aug 18, 2015

 

[Worm0129]

Dukedog, If you are still around and afloat, I'm back with more questions / problems with this 1978-1979 V150. Was having problems with it running again and trouble shot down to the stator. (#398-5454A9). Only 3.84K ohms on blue/red cylinders 2,4,6. Open resistance (no ohm reading) on blue & wht/red & wht cyls 1,3,5. Ordered a replacement stator, 2 new switchbox (#332-7778A 9), and a rectifier (#816770). Installed all parts, tried to start = didn't start. Rechecked wires, realized I had blue/red blue &wht/red & wht on switchboxes. Corrected wires = still not start. Also put in new plugs.
Checked resistance on new stator = 6.35K & 6.08K instead of 3.4K ohms.
Questions: 1--Is the stator the wrong one? 2--Did I majorly screw things up by having blue/red on wrong switchboxes? 3--What is the next step in diagnosing this beast? My wife has HINTED STRONGLY that I should get rid of the boat. Help!
​Original post was from Aug 18, 2015

 

[Mikered]

I I have a question I remove the lower end from my 9.8 Merc to replace my impeller I cannot put it back together I drive forward I tried reverse I tried neutral it will not go back together now my gear changer is stuck in Reverse how do I unstick the leaver

 

[Dukedog]

think tha a9 may be a 16 amp?.. can't tell by anything i've got..not listed.. check all "kil circuit" wiring (all black/yellow), including tha lanyard switch...

Mikered, i have no idea.. strickly a v6 person.. start a new thread and sure you will get an answer.....

 

[Worm0129]

Dukedog, ooohhh. The lanyard switch. That helps it try to start. I forgot the stupid little safety switch. :laugh: Anyway, now it sound like it is trying to backfire and I have gas coming out the carbs. Did the timing change when I changed the stator or switchboxes? I have to borrow a timing light in order to reset it. I don't know why it would change unless the higher ohm reading makes a difference. What do you think?